The reason why I am not optimistic about this sort of thing is because many people know someone clever who has radically different political opinions from them, and they often talk about politics quite a bit. So those sort of Aumann updates often happen, but they often end at a stance like "we both understand each other's opinions of the facts, but have different value systems, and so disagree" or something like "we both assign the same likelihood ratio to evidence, but have very different priors."
I guess my thought was that LWers are likely to think that its possible to implement values incoherently (ie correctably), and so might have much more to say (and learn) other than your average "clever person". Scope neglect, cognitive dissonance, etc, etc.
My guess would be that really solid rationalists might turn out to disagree with each other over really deep values, like one being primarily selfish and sadistic while another has lots of empathy and each can see that each has built a personal narrative around such tendencies, but I wouldn'...
Summary: I propose we somewhat relax our stance on political speech on Less Wrong.
Related: The mind-killer, Mind-killer
A recent series of posts by a well-meaning troll (example) has caused me to re-examine our "no-politics" norm. I believe there has been some unintentional creep from the original intent of Politics is the Mind-Killer. In that article, Eliezer is arguing that discussions here (actually on Overcoming Bias) should not use examples from politics in discussions that are not about politics, since they distract from the lesson. Note the final paragraph:
So, the original intent was not to ban political speech altogether, but to encourage us to come up with less-charged examples where possible. If the subject you're really talking about is politics, and it relates directly to rationality, then you should be able to post about it without getting downvotes strictly because "politics is the mind-killer".
It could be that this drift is less of a community norm than I perceive, and there are just a few folks (myself included) that have taken the original message too far. If so, consider this a message just to those folks such as myself.
Of course, politics would still be off-topic in the comment threads of most posts. There should probably be a special open thread (or another forum) to which drive-by political activists can be directed, instead of simply saying "We don't talk about politics here".
David_Gerard makes a similar point here (though FWIW, I came up with this title independently).